// import Vue from 'vue'
// import store from '@/store'
// const Vue = require('vue')

const gps = {
  PI: 3.14159265358979324,
  x_pi: (3.14159265358979324 * 3000.0) / 180.0,
  delta: function (lat, lon) {
    // eslint-disable-next-line
    if (typeof lat) lat = typeof lat === 'string' ? parseFloat(lat) : lat
    lon = typeof lon === 'string' ? parseFloat(lon) : lon
    // Krasovsky 1940
    //
    // a = 6378245.0, 1/f = 298.3
    // b = a * (1 - f)
    // ee = (a^2 - b^2) / a^2;
    var a = 6378245.0 //  a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
    var ee = 0.00669342162296594323 //  ee: 椭球的偏心率。
    var dLat = this.transformLat(lon - 105.0, lat - 35.0)
    var dLon = this.transformLon(lon - 105.0, lat - 35.0)
    var radLat = (lat / 180.0) * this.PI
    var magic = Math.sin(radLat)
    magic = 1 - ee * magic * magic
    var sqrtMagic = Math.sqrt(magic)
    dLat = (dLat * 180.0) / (((a * (1 - ee)) / (magic * sqrtMagic)) * this.PI)
    dLon = (dLon * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * this.PI)
    return { lat: dLat, lon: dLon }
  },

  //WGS-84 to GCJ-02 离线转高德
  gcj_encrypt: function (wgsLat, wgsLon) {
    if (typeof wgsLon == 'string') {
      wgsLon = parseFloat(wgsLon)
      wgsLat = parseFloat(wgsLat)
    }
    if (this.outOfChina(wgsLat, wgsLon)) return { lat: wgsLat, lon: wgsLon }

    var d = this.delta(wgsLat, wgsLon)
    const latitude = wgsLat + d.lat
    const longitude = wgsLon + d.lon
    return { latitude, longitude }
  },
  //GCJ-02 to WGS-84 高德转离线
  gcj_decrypt: function (gcjLon, gcjLat, isArr = true) {
    if (typeof gcjLon == 'string') {
      gcjLon = parseFloat(gcjLon)
      gcjLat = parseFloat(gcjLat)
    }
    // if (this.outOfChina(gcjLat, gcjLon)) return { lat: gcjLat, lon: gcjLon }
    if (this.outOfChina(gcjLat, gcjLon)) return ['0', '0']

    var d = this.delta(gcjLat, gcjLon)
    const latitude = gcjLat - d.lat
    const longitude = gcjLon - d.lon
    return isArr ? [longitude, latitude] : { latitude, longitude }
  },
  // 1.Gcj => WGS 高德转离线   2.离线转高德WGS => Gcj
  GcjWGSConversion: function ({ Lon, Lat, type }) {
    if (type === 1) {
      return this.gcj_decrypt(Lon, Lat, false) //高德转离线
    } else if (type === 2) {
      return this.gcj_encrypt(Lat, Lon) //离线转高德
    }
  },
  //GCJ-02 to WGS-84 exactly
  // gcj_decrypt_exact: function (gcjLat, gcjLon) {
  //   var initDelta = 0.01
  //   var threshold = 0.000000001
  //   var dLat = initDelta,
  //     dLon = initDelta
  //   var mLat = gcjLat - dLat,
  //     mLon = gcjLon - dLon
  //   var pLat = gcjLat + dLat,
  //     pLon = gcjLon + dLon
  //   var wgsLat,
  //     wgsLon,
  //     i = 0
  //   while (1) {
  //     wgsLat = (mLat + pLat) / 2
  //     wgsLon = (mLon + pLon) / 2
  //     var tmp = this.gcj_encrypt(wgsLat, wgsLon)
  //     dLat = tmp.lat - gcjLat
  //     dLon = tmp.lon - gcjLon
  //     if (Math.abs(dLat) < threshold && Math.abs(dLon) < threshold) break
  //
  //     if (dLat > 0) pLat = wgsLat
  //     else mLat = wgsLat
  //     if (dLon > 0) pLon = wgsLon
  //     else mLon = wgsLon
  //
  //     if (++i > 10000) break
  //   }
  //   return { lat: wgsLat, lon: wgsLon }
  // },
  //GCJ-02 to BD-09
  bd_encrypt: function (gcjLon, gcjLat, isArr = true) {
    var x = gcjLon,
      y = gcjLat
    var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * this.x_pi)
    var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * this.x_pi)
    var bdLon = z * Math.cos(theta) + 0.0065
    var bdLat = z * Math.sin(theta) + 0.006
    return isArr ? [bdLon, bdLat] : { lat: bdLat, lon: bdLon }
  },
  //BD-09 to GCJ-02 (目前用到的是 这个，百度 转 高德)
  bd_decrypt: function (bdLon, bdLat, isArr = true) {
    if (typeof bdLon == 'string') {
      bdLon = parseFloat(bdLon)
      bdLat = parseFloat(bdLat)
    }
    var x = bdLon - 0.0065,
      y = bdLat - 0.006
    var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * this.x_pi)
    var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * this.x_pi)
    var gcjLon = z * Math.cos(theta)
    var gcjLat = z * Math.sin(theta)
    return isArr ? [gcjLon, gcjLat] : { latitude: gcjLat, longitude: gcjLon }
  },
  //WGS-84 to Web mercator
  //mercatorLat -> y mercatorLon -> x
  mercator_encrypt: function (wgsLat, wgsLon) {
    var x = (wgsLon * 20037508.34) / 180
    var y = Math.log(Math.tan(((90 + wgsLat) * this.PI) / 360)) / (this.PI / 180)
    y = (y * 20037508.34) / 180
    return { lat: y, lon: x }
    /*
      if ((Math.abs(wgsLon) > 180 || Math.abs(wgsLat) > 90))
          return null;
      var x = 6378137.0 * wgsLon * 0.017453292519943295;
      var a = wgsLat * 0.017453292519943295;
      var y = 3189068.5 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
      return {'lat' : y, 'lon' : x};
      //*/
  },
  // Web mercator to WGS-84
  // mercatorLat -> y mercatorLon -> x
  mercator_decrypt: function (mercatorLat, mercatorLon) {
    var x = (mercatorLon / 20037508.34) * 180
    var y = (mercatorLat / 20037508.34) * 180
    y = (180 / this.PI) * (2 * Math.atan(Math.exp((y * this.PI) / 180)) - this.PI / 2)
    return { lat: y, lon: x }
    /*
      if (Math.abs(mercatorLon) < 180 && Math.abs(mercatorLat) < 90)
          return null;
      if ((Math.abs(mercatorLon) > 20037508.3427892) || (Math.abs(mercatorLat) > 20037508.3427892))
          return null;
      var a = mercatorLon / 6378137.0 * 57.295779513082323;
      var x = a - (Math.floor(((a + 180.0) / 360.0)) * 360.0);
      var y = (1.5707963267948966 - (2.0 * Math.atan(Math.exp((-1.0 * mercatorLat) / 6378137.0)))) * 57.295779513082323;
      return {'lat' : y, 'lon' : x};
      //*/
  },
  // bg-09 to wgs-84
  bd_84: function (lon, lat) {
    const [logc, latc] = this.bd_decrypt(lon, lat)
    return gps.gcj_decrypt(logc, latc)
  },
  // two point's distance
  distance: function (latA, lonA, latB, lonB) {
    var earthR = 6371000
    var x =
      Math.cos((latA * this.PI) / 180) *
      Math.cos((latB * this.PI) / 180) *
      Math.cos(((lonA - lonB) * this.PI) / 180)
    var y = Math.sin((latA * this.PI) / 180) * Math.sin((latB * this.PI) / 180)
    var s = x + y
    if (s > 1) s = 1
    if (s < -1) s = -1
    var alpha = Math.acos(s)
    var distance = alpha * earthR
    return distance
  },
  outOfChina: function (lat, lon) {
    if (lon < 72.004 || lon > 137.8347) return true
    if (lat < 0.8293 || lat > 55.8271) return true
    return false
  },
  transformLat: function (x, y) {
    var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x))
    ret += ((20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0) / 3.0
    ret += ((20.0 * Math.sin(y * this.PI) + 40.0 * Math.sin((y / 3.0) * this.PI)) * 2.0) / 3.0
    ret +=
      ((160.0 * Math.sin((y / 12.0) * this.PI) + 320 * Math.sin((y * this.PI) / 30.0)) * 2.0) / 3.0
    return ret
  },
  transformLon: function (x, y) {
    var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x))
    ret += ((20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0) / 3.0
    ret += ((20.0 * Math.sin(x * this.PI) + 40.0 * Math.sin((x / 3.0) * this.PI)) * 2.0) / 3.0
    ret +=
      ((150.0 * Math.sin((x / 12.0) * this.PI) + 300.0 * Math.sin((x / 30.0) * this.PI)) * 2.0) /
      3.0
    return ret
  }
}

const offlinebd = (lon, lat) => {
  const [logc, latc] = gps.bd_decrypt(lon, lat)
  return gps.gcj_decrypt(latc, logc)
}

module.exports = {
  offlinebd,
  gps
}
